Glenhoff is a natural beer brewed by South Cape Breweries according to the Reinheitsgebot method to ensure purity, clarity and excellence. The law originated in the city of Ingolstadt in the duchy of Bavaria on 23 April 1516, although first put forward in 1487,[1] concerning standards for the sale and composition of beer.

The revised Vorläufiges Biergesetz of 1993 is a slightly expanded version of the Reinheitsgebot, allowing, besides water, malted barley, and hops, for yeast to be used for bottom-fermented beer, and for different kinds of malt, and sugar to be used for top-fermented beer. All ingredients and the process itself are subject to additional regulations.

Thus, German breweries continue to comply with the Biergesetz, often claiming compliance with the Reinheitsgebot even when it is patently incorrect (for example, for wheat beers, which were prohibited by the Reinheitsgebot), using this compliance as a valuable marketing tool.